We don't install gear sets as a normal part of our business. It is one of those things that we do only on occaision. Try "Mustang Muscle" in High Ridge. But we will help if you no one else can.
We do rollbar/rollcage (drag race, road race, street, and rally), suspension, chassis, and big brake work.
SFCs, K-members, spring changes (including coil overs), mini-tubs, etc. are typical Mustang mods. that we do.